This is a very accurate controller. It has an adjustable temperature differential--which is great for steam or gravity heating systems that take a long time to start up and fully charge throughout a building. My old Honeywell Provision controller was too sensitive and shut off the system prematurely. This unit is more adaptable, but holdonto the programming instructions; the programming buttons take a little getting used to.

This is a very accurate controller. It has an adjustable temperature differential--which is great for steam or gravity heating systems that take a long time to start up and fully charge throughout a building. My old Honeywell Provision controller was too sensitive and shut off the system prematurely. This unit is more adaptable, but holdonto the programming instructions; the programming buttons take a little getting used to.